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What is the [f 5/4 cut] switch for?

F stands for floating point number, 5/4 will round up on 5 down on 4, and cut will just cut off the insignificant digits (decimals)

What is the [5,4,3,2,1,0 add (2)] switch used for?

This switch is used to determine how many decimal places your answer is displayed in.  Add (2) is for monetary calculations, it is not necessary to enter the decimal point.  It is automatically placed two spots from the end for cents.  Entering; 1 2 3 will display as 1.23

What tests are calculators permitted for?

AP Calculus requires a graphing calculator
Any graphing or scientific calculator is permitted on the following as long as it does not have a QWERTY keyboard, electronic writing pad or a pen-input/ stylus-driven:
PSAT/NMSQT, SAT I
SAT II Math, IC & IIC
AP Statistics (graphing expected)
AP Chemistry
AP Physics
See www.collegeboard.com for more information
For the GED the FX260 solar is suggested

How do I perform a currency conversion?

If you want to convert 100 euros to US dollars, you would do the following:
1. Press [AC]
2. Enter 100 and then press [C2]
3. Press [C1] to convert to dollars
4. To convert back to euros again, press [C2]
You can also perform a currency conversion within a calculation. How much in US dollars would five items selling at 100 euros cost?
1. Press [AC]
2. Enter 5 [×] 100 and then press [C2]
3. Press [C1] [=]

Programming Tax Rate
Non-printing models (also applies to HR-8TE printing calculator):
1. Press [AC]
2. Hold [SET/%] key for about 2 seconds
3. Press [TAX+]
4. Input the tax rate
5. Press [SET/%]

Printing models (except HR-8TE):
1. Have calculator in “print” mode
2. Press [CA]
3. Hold [SET/%] key for about 3 seconds
4. Input the tax rate
5. Press [TAX+]
6. Press [SET/%] 

I am having a problem registering the Classpad 300, The web site states the product key is wrong.

Input only the numbers, avoid the letters.

For more Frequently Asked Questions for Calculators, please go here.